frighten vs shake up

frighten and shake up both are verbs.

Word	Noun	Adjective	Verb	Adverb
frighten	No	No	Yes	No
shake up	No	No	Yes	No

As verbs, shake up is a hypernym of frighten; that is, shake up is a word with a broader meaning than frighten:

Other hypernyms of frighten include excite, shake, stimulate, stir.

frighten (verb)	shake up (verb)
cause fear in	make fuller by shaking
	change the arrangement or position of
	stir the feelings, emotions, or peace of
	shock physically
	shake; especially (a patient to detect fluids or air in the body)
	organize anew